CN112821658A - Motor axial traction mechanism based on permanent magnet attraction force and vertical motor - Google Patents
Motor axial traction mechanism based on permanent magnet attraction force and vertical motor Download PDFInfo
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- CN112821658A CN112821658A CN202110293097.XA CN202110293097A CN112821658A CN 112821658 A CN112821658 A CN 112821658A CN 202110293097 A CN202110293097 A CN 202110293097A CN 112821658 A CN112821658 A CN 112821658A
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- motor
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- rotor shaft
- traction mechanism
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
Abstract
The application provides a motor axial traction mechanism based on permanent magnet attraction and a vertical motor, wherein the motor axial traction mechanism based on permanent magnet attraction comprises a cover body, wherein the cover body is fixed at the top of a motor shell; and the magnet is fixed on the cover body and generates upward suction force to the rotor shaft and the element mounted on the rotor shaft. The motor axial traction mechanism based on the permanent magnet suction provides axial suction for the rotor shaft of the vertical motor under the condition that extra power consumption is not increased, reduces axial thrust borne by the bearing, and reduces the wear degree and the maintenance difficulty of a bearing system of the vertical motor.
Description
Technical Field
The application relates to the technical field of motors, in particular to a motor axial traction mechanism based on permanent magnet suction and a vertical motor.
Background
Rotating electrical machines are generally available in both horizontal and vertical forms. The centrifugal force and the gravity when the horizontal rotating motor operates are both in the radial direction, and the centrifugal force and the gravity are combined into radial force, so that the radial stress of the rotor shaft is uneven to deform, and the air gap of the motor is further changed. Meanwhile, the radial stress of the rotor shaft is shared by the bearings at the two ends of the rotor shaft, but each bearing is only supported by the ball at the lower side, and the rest balls are not supported, so that the abrasion of the bearings is accelerated. The vertical rotating motor is vertically arranged on the driving mechanism and is widely used for vertical water pumps and vertical lathes. Different from a horizontal rotating motor, the gravity borne by the rotor shaft of the vertical rotating motor is orthogonal to the radial centrifugal force during operation along the axial direction, so that the radial uneven stress of the rotor shaft is avoided.
Since the rotor shaft of the vertical rotating electrical machine receives a force of gravity in the axial direction, a large axial supporting force is required. The existing vertical motor bears the radial centrifugal force when the rotor rotates mainly through an angular contact bearing arranged on the upper part of the rotor shaft, and ensures that the rotor shaft is fixed in the radial position. The axial forces of the rotor shaft are mainly supported by the lower thrust bearing.
However, the angular contact bearing and the thrust bearing can bear limited axial force, the limit rotating speed of the thrust bearing is very low, and the axial force which can be borne by the thrust bearing is further reduced under the condition of high speed, so that the bearing is damaged, and the motor fails.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
An object of the application is to provide a motor axial traction mechanism and a vertical motor based on permanent magnet suction to solve the problems existing in the prior art.
In order to achieve the above purpose, the present application provides the following technical solutions: the motor axial traction mechanism based on the permanent magnet attraction force comprises
The cover body is fixed at the top of the motor shell;
and the magnet is fixed on the cover body and generates upward suction force to the rotor shaft and the element mounted on the rotor shaft.
Furthermore, the traction mechanism also comprises a rotor iron core, wherein the rotor iron core is disc-shaped, is fixed at the top of the rotor shaft and is coaxial with the rotor shaft;
preferably, a first flange plate is arranged on the rotor shaft, and the rotor iron core is in flange connection with the rotor shaft.
Furthermore, the axial traction mechanism also comprises a magnetic body which is fixed at the top of the rotor shaft and mutually attracted with the magnetic body.
Furthermore, the cover body comprises an installation part and a connection part, the connection part is used for being fixedly connected with the motor shell, the installation part is disc-shaped and is positioned right above the rotor shaft, and the magnet is fixed on the installation part;
preferably, the magnet is a permanent magnet and is of a disc type;
the radial dimension of the rotor iron core is larger than that of the permanent magnet.
Furthermore, a second flange is arranged on the radial outer side of the connecting part, unthreaded holes are formed in the second flange, threaded holes are formed in the motor shell, the positions and the number of the threaded holes correspond to those of the unthreaded holes, and the second flange is connected with the motor shell through a threaded assembly;
the thread component comprises a headless bolt, a first fastening nut and a second fastening nut, the headless bolt is provided with a radial bulge, the radial bulge is positioned between the motor shell and the second flange plate, the lower end of the headless bolt is in threaded connection with the threaded hole, the upper part of the headless bolt penetrates out of the unthreaded hole, the first fastening nut is in threaded connection with the upper part of the thread of the headless bolt, the first fastening nut and the radial bulge clamp the second flange plate, and the second fastening nut is in threaded connection with the headless bolt and tightly pressed on the hole edge of the threaded hole;
an adjusting gap is formed between the connecting part and the motor shell along the vertical direction, and an axial gap is formed between the magnet and the rotor iron core;
preferably, the radial projection is an annular projection.
Further, the connecting part is annular;
a first circumferential annular gap is formed between the magnet and the inner wall of the connecting part.
Further, a second circumferential annular gap is formed between the rotor core and the inner wall of the connecting portion.
The utility model provides a vertical motor, includes motor casing and rotor shaft, and the both ends of rotor shaft are passed through the bearing and are fixed on motor casing, still include the motor axial drive mechanism based on permanent magnet suction, and the motor axial drive mechanism based on permanent magnet suction includes:
the cover body is fixed at the top of the motor shell;
and the magnet is fixed on the cover body and generates upward suction force to the rotor shaft and the element mounted on the rotor shaft.
Furthermore, the traction mechanism also comprises a rotor iron core, wherein the rotor iron core is disc-shaped, is fixed at the top of the rotor shaft and is coaxial with the rotor shaft;
preferably, a first flange plate is arranged on the rotor shaft, and the rotor iron core is in flange connection with the rotor shaft.
Furthermore, the axial traction mechanism also comprises a magnetic body which is fixed at the top of the rotor shaft and mutually attracted with the magnetic body.
Furthermore, the cover body comprises an installation part and a connection part, the connection part is used for being fixedly connected with the motor shell, the installation part is disc-shaped and is positioned right above the rotor shaft, and the magnet is fixed on the installation part;
preferably, the magnet is a permanent magnet and is of a disc type;
the radial dimension of the rotor iron core is larger than that of the permanent magnet.
Furthermore, a second flange is arranged on the radial outer side of the connecting part, unthreaded holes are formed in the second flange, threaded holes are formed in the motor shell, the positions and the number of the threaded holes correspond to those of the unthreaded holes, and the second flange is connected with the motor shell through a threaded assembly;
the thread component comprises a headless bolt, a first fastening nut and a second fastening nut, the headless bolt is provided with a radial bulge, the radial bulge is positioned between the motor shell and the second flange plate, the lower end of the headless bolt is in threaded connection with the threaded hole, the upper part of the headless bolt penetrates out of the unthreaded hole, the first fastening nut is in threaded connection with the upper part of the thread of the headless bolt, the first fastening nut and the radial bulge clamp the second flange plate, and the second fastening nut is in threaded connection with the headless bolt and tightly pressed on the hole edge of the threaded hole;
an adjusting gap is formed between the connecting part and the motor shell along the vertical direction, and an axial gap is formed between the magnet and the rotor iron core;
preferably, the radial projection is an annular projection.
Further, the connecting part is annular;
a first circumferential annular gap is formed between the magnet and the inner wall of the connecting part.
Further, a second circumferential annular gap is formed between the rotor core and the inner wall of the connecting portion.
Furthermore, the upper end part of the rotor shaft is fixed on the motor shell through an angular contact bearing;
preferably, the number of the angular contact bearings is two, and the two angular contact bearings are arranged in a face-to-face mode; alternatively, the two angular contact bearings are arranged back to back.
Further, the lower end portion of the rotor shaft is fixed to the motor housing through a bidirectional thrust bearing or two angular contact bearings, which are disposed face to face or back to back.
Compared with the closest prior art, the technical scheme of the embodiment of the application has the following beneficial effects:
1) the motor axial traction mechanism based on the permanent magnet suction provides axial suction for the rotor shaft of the vertical motor under the condition that extra power consumption is not increased, reduces axial thrust borne by the bearing, and reduces the wear degree and the maintenance difficulty of a bearing system of the vertical motor.
2) The motor axial traction mechanism based on the permanent magnet attraction can effectively reduce the axial thrust borne by the rotor shaft bearing, does not add extra loss, and can reduce the maintenance cost and increase the design flexibility.
3) And the rotor core is connected with the rotor shaft flange, so that the connection is reliable.
4) The magnetic body and the permanent magnet attract each other to increase the attraction force to the rotor shaft.
5) The magnet is fixed right above the rotor shaft, and can generate larger attraction force when the magnet with the same mass is used.
6) The threaded component is flexible to use and can achieve high adjustment precision.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. Wherein:
fig. 1 is a schematic structural view of an embodiment of a vertical motor according to the present application;
fig. 2 is a partial structural schematic diagram of the motor axial traction mechanism based on permanent magnet attraction in fig. 1.
In the figure: 1. the cover body comprises a cover body 101, an installation part 102, a connecting part 1021, a second flange plate 2, a permanent magnet 3, a rotor iron core 4, a first flange plate 5, a rotor shaft 6, a headless bolt 61, a radial bulge 7, a first fastening nut 8, a second fastening nut 9, a threaded hole 10, a unthreaded hole 11, an angular contact bearing 12, a motor shell 13 and a bidirectional thrust bearing.
Detailed Description
The present application will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the application and are not limiting of the application. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the application. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present application cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
The specific embodiment of the vertical motor of the invention: as shown in fig. 1 and 2, the vertical motor includes a rotor shaft 5, a motor housing 12, and a motor axial traction mechanism based on permanent magnet attraction force, where the rotor shaft 5 and the motor housing 12 are common structures of motors in the prior art and are not described herein again. The motor axial traction mechanism based on the permanent magnet attraction force comprises a cover body 1, a magnet, a rotor iron core 3 and a threaded assembly, wherein the magnet is a disc-shaped permanent magnet 2.
The cover body 1 includes an installation portion 101 and a connection portion 102 (the installation portion 101 constitutes a stator core yoke portion, the connection portion 102 constitutes a stator core tooth portion), the connection portion 102 is annular and is fixedly connected with the motor housing 12 through a screw assembly, and the installation portion 101 is disc-shaped and is located right above the rotor shaft 5. The mounting portion 101 and the connecting portion 102 are made of a magnetic conductive metal material to form a magnetic flux circuit, and the cover 1 has high structural strength, so that the cover 1 can be reliably fixed to the motor housing 12. In this embodiment, the cover body 1 is integrally formed, the structural strength is high, and the number of processing steps is small. Alternatively, the mounting portion 101 and the connecting portion 102 may be manufactured separately and then connected together, and the connection may be made by screwing, welding, screwing, or bonding. Optionally, the material of the mounting portion 101 and the connecting portion 102 is one of electrical pure iron, silicon steel sheet, and soft magnetic composite material.
The radial outside of connecting portion 102 is equipped with second ring flange 1021, is equipped with unthreaded hole 10 on the second ring flange 1021, is equipped with screw hole 9 on the motor casing 12, and the position and the quantity of screw hole 9 correspond with unthreaded hole 10, and second ring flange 1021 passes through screw assembly with motor casing 12 and is connected.
The threaded component comprises a headless bolt 6, a first fastening nut 7 and a second fastening nut 8, a radial protrusion 61 is arranged on the headless bolt 6, the radial protrusion 61 is an annular protrusion and is located between a motor shell 12 and a second flange plate 1021, the lower end of the headless bolt 6 is in threaded connection with a threaded hole 9, a smooth hole 10 is formed in the upper portion of the headless bolt 6 in a penetrating mode, the first fastening nut 7 is in threaded connection with the upper portion of the headless bolt 6, and the first fastening nut 7 and the radial protrusion 61 clamp the second flange plate 1021 to fix the cover body 1. The second fastening nut 8 is screwed onto the headless bolt 6 and pressed against the edge of the threaded hole 9, preventing a loose positioning between the headless bolt 6 and the motor housing 12.
Alternatively, the screw assembly may take other forms, for example, the screw assembly includes a bolt and a gasket, the bolt passes through the unthreaded hole 10 on the second flange plate 1021 to be connected with the threaded hole 9, the gasket is arranged between the hole edges of the second flange plate 1021 and the threaded hole 9, the gasket is sleeved on the bolt, the bolt realizes connection between the cover body 1 and the motor housing 12, and the axial gap La between the magnet and the rotor core 3 is adjusted by adjusting the number and thickness of the gasket.
An adjustment gap is formed between the coupling portion 102 and the motor housing 12 in the vertical direction, and an axial gap La is formed between the magnet and the mover core 3, so that the relative position between the cover 1 and the motor housing 12 can be adjusted, and the axial gap La between the permanent magnet 2 and the mover core 3 can be adjusted. Reliable positioning and flexible adjustment between the permanent magnet 2 and the rotor core 3 are very important, and directly affect the axial gap La between the permanent magnet 2 and the rotor core 3, thereby affecting the axial suction force applied to the rotor core 3. The permanent magnet 2 generates axial suction to the rotor core 3, and the axial relative position of the permanent magnet 2 and the rotor core 3 can be adjusted by adjusting the depth of the headless bolt 6 screwed into the threaded hole 9, namely, the axial gap La between the permanent magnet 2 and the rotor core 3 is adjusted, so that the axial suction generated by the permanent magnet 2 to the rotor core 3 is changed.
The permanent magnet 2 is fixed on the installation part 101 of the cover body 1, the fixing mode can adopt gluing, and in order to reduce the magnetic resistance of the main magnetic circuit, the permanent magnet 2 and the installation part 101 are tightly connected. A first circumferential annular gap Lsr is provided between the permanent magnet 2 and the inner wall of the connection portion 102. Permanent magnet 2 magnetizes along the axial and forms two magnetic poles, and two magnetic poles distribute in lid 1 along upper and lower direction, and lid 1 and active cell iron core 3 form closed magnetic field return circuit: the main magnetic flux path of the permanent magnet 2 starts from the permanent magnet 2, passes through the mounting portion 101, the connecting portion 102 and the rotor core 3 in sequence, and finally returns to the permanent magnet 2 to form a closed magnetic circuit. The permanent magnets 2 generate an upward suction force to the rotor shaft 5 and elements (mainly, the mover cores 3) mounted on the rotor shaft 5.
The rotor core 3 is disc-shaped and coaxially fixed on the top of the rotor shaft 5, the radial dimension of the rotor core 3 is larger than that of the permanent magnet 2, a second circumferential annular gap Lmr is formed between the rotor core 3 and the inner wall of the connecting part 102, and the fixing mode is as follows: and a first flange plate 4 is arranged on the rotor shaft 5, and the rotor iron core 3 is in flange connection with the rotor shaft 5. Optionally, the material of the mover core 3 is one of electrical pure iron, silicon steel sheets, and soft magnetic composite materials.
To avoid magnetic leakage, the first circumferential annular gap Lsr between the permanent magnet 2 and the coupling portion 102 should be larger than the sum of the axial gap La between the permanent magnet 2 and the mover core 3 and the second circumferential annular gap Lmr between the coupling portion 102 and the mover core 3, i.e., Lsr > La + Lmr: the axial gap La between the permanent magnet 2 and the rotor core 3 is closely related to the axial suction force of the permanent magnet 2 to the rotor shaft 5, and the axial suction force can be adjusted by adjusting the axial gap La. The second circumferential annular gap Lmr between the rotor core 3 and the connecting part 102 is also a part of the main magnetic circuit, the first circumferential annular gap Lsr between the permanent magnet 2 and the connecting part 102 is a main part of the leakage magnetic circuit of the permanent magnet 2, and the larger first circumferential annular gap Lsr can cause the magnetic resistance of the leakage magnetic circuit to be larger and reduce the leakage magnetic flux of the permanent magnet 2; to increase the main flux and reduce the leakage flux, Lsr > La + Lmr should be made.
Alternatively, in other embodiments, the mover core 3 is replaced with a magnetic body: the magnetic body is fixed on the top of the rotor shaft 5 and adopts the same magnetizing direction as the permanent magnet 2. The magnetic body and the permanent magnet 2 attract each other, increasing the attraction force to the rotor shaft 5.
The two ends of the rotor shaft 5 are fixed on the motor housing 12 through bearings, wherein the upper end is fixed on the motor housing 12 through an angular contact bearing 11; the number of the angular contact bearings 11 is two, and optionally, the two angular contact bearings 11 are arranged face to face; alternatively, the two angular contact bearings 11 are arranged back to back.
Alternatively, the lower end of the rotor shaft 5 is fixed to the motor housing 12 by a bidirectional thrust bearing 13, or two angular contact bearings 11 arranged face to face, or two angular contact bearings 11 arranged back to back, in this embodiment, the bidirectional thrust bearing 13 is selected.
In the use process of the vertical motor, when the axial and upward suction force applied to the rotor shaft 5 needs to be increased to reduce the axial force applied to the upper end bearing and the lower end bearing of the rotor shaft 5, the first fastening nut 7 and the second fastening nut 8 are unscrewed, the headless bolt 6 is screwed into the threaded hole 9 for a proper length, and then the first fastening nut 7 and the second fastening nut 8 are screwed, so that the axial gap La between the permanent magnet 2 and the rotor core 3 can be reduced, and the axial suction force applied to the rotor shaft 5 can be increased. On the contrary, when the axial suction force applied to the rotor shaft 5 needs to be reduced, the first fastening nut 7 and the second fastening nut 8 are unscrewed, the headless bolt 6 is screwed out of the threaded hole 9 for a proper length, and then the first fastening nut 7 and the second fastening nut 8 are screwed, so that the axial gap La between the permanent magnet 2 and the rotor core 3 is increased, and the axial suction force applied to the rotor shaft 5 is reduced. In the process of changing the axial gap La between the permanent magnet 2 and the mover core 3 and the axial attractive force to which the rotor shaft 5 is subjected, the first circumferential annular gap Lsr between the permanent magnet 2 and the connecting portion 102 and the second circumferential annular gap Lmr between the mover core 3 and the connecting portion 102 do not change, so that the adjustment of the rotor shaft 5 to which the axial attractive force is subjected is simplified.
In the embodiment of the motor axial traction mechanism based on permanent magnet attraction, the structure of the motor axial traction mechanism based on permanent magnet attraction is the same as that in the embodiment of the vertical motor, and the detailed description is omitted.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. Motor axial drive mechanism based on permanent magnet suction, its characterized in that includes:
the cover body is fixed at the top of the motor shell;
and the magnet is fixed on the cover body and generates upward suction force to the rotor shaft and an element arranged on the rotor shaft.
2. The permanent magnet suction based electric machine axial traction mechanism of claim 1, further comprising a rotor core, said rotor core being disk-shaped, fixed on top of said rotor shaft, and coaxial with said rotor shaft;
preferably, the rotor shaft is provided with a first flange plate, and the rotor core is connected with the rotor shaft through a flange.
3. The permanent magnet attraction based motor axial traction mechanism of claim 1 further comprising a magnetic body affixed to the top of the rotor shaft and attracting the magnet.
4. The permanent magnet attraction-based motor axial traction mechanism as claimed in claim 2, wherein the cover body comprises a mounting portion and a connecting portion, the connecting portion is used for being fixedly connected with the motor shell, the mounting portion is disc-shaped and located right above the rotor shaft, and the magnet is fixed on the mounting portion;
preferably, the magnet is a permanent magnet and is of a disc shape;
the radial size of the rotor iron core is larger than that of the permanent magnet.
5. The motor axial traction mechanism based on permanent magnet attraction force of claim 4, wherein a second flange is arranged on the radial outer side of the connecting part, a light hole is formed in the second flange, threaded holes are formed in the motor shell, the positions and the number of the threaded holes correspond to those of the light hole, and the second flange is connected with the motor shell through a threaded assembly;
the thread component comprises a headless bolt, a first fastening nut and a second fastening nut, a radial bulge is arranged on the headless bolt, the radial bulge is located between the motor shell and the second flange plate, the lower end of the headless bolt is in threaded connection with the threaded hole, the upper portion of the headless bolt penetrates out of the unthreaded hole, the first fastening nut is in threaded connection with the upper portion of the threads of the headless bolt, the first fastening nut and the radial bulge clamp the second flange plate, and the second fastening nut is in threaded connection with the headless bolt and tightly pressed on the hole edge of the threaded hole;
an adjusting gap is formed between the connecting part and the motor shell along the vertical direction, and an axial gap is formed between the magnet and the rotor iron core;
preferably, the radial projection is an annular projection.
6. The permanent magnet attraction based motor axial traction mechanism of claim 5, wherein the connection portion is annular;
a first circumferential annular gap is formed between the magnet and the inner wall of the connecting part.
7. The permanent magnet suction based motor axial traction mechanism of claim 6, wherein a second circumferential annular gap is provided between the rotor core and the inner wall of the connecting portion.
8. A vertical motor comprising a motor housing and a rotor shaft, wherein two end portions of the rotor shaft are fixed on the motor housing through bearings, and the vertical motor further comprises a motor axial traction mechanism based on permanent magnet attraction force according to any one of claims 1 to 7.
9. The vertical motor according to claim 8, wherein an upper end portion of the rotor shaft is fixed to the motor housing by an angular contact bearing;
preferably, the number of the angular contact bearings is two, and the two angular contact bearings are arranged in a face-to-face mode; alternatively, the two angular contact bearings are arranged back to back.
10. The vertical motor according to claim 8, wherein a lower end portion of the rotor shaft is fixed to the motor housing by a bidirectional thrust bearing or two angular contact bearings, which are disposed face to face or back to back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110293097.XA CN112821658B (en) | 2021-03-18 | 2021-03-18 | Motor axial traction mechanism based on permanent magnet attraction force and vertical motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110293097.XA CN112821658B (en) | 2021-03-18 | 2021-03-18 | Motor axial traction mechanism based on permanent magnet attraction force and vertical motor |
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| CN112821658A true CN112821658A (en) | 2021-05-18 |
| CN112821658B CN112821658B (en) | 2022-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110293097.XA Active CN112821658B (en) | 2021-03-18 | 2021-03-18 | Motor axial traction mechanism based on permanent magnet attraction force and vertical motor |
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